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As shown by Pauwels, pressure on the femoral head is equal to the sum of the weight of the superior part of the body and of the force of the abductor muscles necessary to stabilize the pelvis. If the length of the femoral head is normal, the pressure is three times the weight of the body; if the neck is short, the pressure may be five or six times that weight. (Reproduced by permission from Revue de Chirurgie, 71: 284, 1952.)
